Electric condenser.



No. 388,275 I PATENTED MAY 19, 1908.

M, O. TROY.

ELECTRIC CONDENSER,

ABPLIUATION FILED MAE. 81, 1902. RENEWED HOV.11.1907.

v ZQ Matthew O.TFQH.

11% (0M3 y QM 4:40;.

ltL-tSSAtlIlISET'lS, ASSIGNOR TO GENERAL ELECTRIC COMPANY,

A. (.OltPOltAlION OF NEW YORK.

ELECTRIC CONDENSER.

Application filed March 31, 1902, Serial No. 100,717.

To all whom 'it' may concern:

Be it known that I, hIATTHEW TROY, a citizen of the United States, residing at Lynn, county of Essex, State of Massachu- Improvements in Electric Condensers, of which the following is a specrhcation.

My present invention relates to electrical '1 Specification of Letters Patent.

condensers and is particidarly valuable where it is desired to produce. a condenser capable of withstanding high electromotive forces without breaking down and without heating unduly.

In makne' up a condenser in aceordain-e with my invention, l. employ a dielectric of composite structure, one of the elements of which possesses a relatively high resistance to break down, and the other relatively 'h gh insulation resistance.

The drawing represents a condenser 01 my invention in process oi construction.

The novel features of the invention are pointed out 111 the appended claims, and-the details of coi'istruction of a condenser embodying the invention are described in the following specification.

/In buildinp up a condenser in accordance with my invention, 1 make use of a varnished paper as the medium f or securing high resist- 80 ance to break down of the condenser, and as? sociated with the .'arnisl1e l paper are sheets of paper impregmited with parallin or other wax or mixtures of waxes. Instead of 1mpregnatinp the sheets of pa or with paratlin or other Wax before assomb ing them in the condenser, I prefer'to postpone this operation until the condenser has been assembled, after which the condenser as a whole may be treated in abath of wax. as set forth, for example,

40 'in-the patent to Thomson No. 601,675, Jame ary 2l.,-"1902. In the caseof the varnished paper employed as a part of the dielectric oi the condenser, I prefer to prepare this prior to assembling the condenser.

The drawing represents a condenser in noce'ss oi: tlSSGl'Ilb ing. The compact bundl e of sheets at 1 indicates the portion already assembled, while the separate sheets 2, 3, 4 and Patented May 19, 1908.

Renewed November 11, 1907. Serial No. 401,730.

5 indicate the order in which the subsequent sheets are to be'superposcd. The part 6 rep resents a sheet .ot tin-foil upon w nchis superposed an untreated sheet 2 which may be 5 setts, have invented certain new and use'lul 1 I l' bond paper, then a varnished eet of bond paper 3, then another untreated sheet of bond paper 4, and then the next sheet of tin-foil and so on.

lnsteadoi' lacinp only a single sheet of untreated born paper between each sheet of tin-toil and the varnished paper, I may oi" course for additional security make use of a nmnber of sheets, while in the same way instead of a single sheet of varnished paper l.

may employ a plurality thereof.

After the condenser has been assembled it is impregnated with a suitable insulating medium, as parallin wax, thereby filling the untreated paper with the insulating wax and excluding any air or bubbles which may remain in the body oi'ythc condenser proper.

The use of varnished paper alone as the dielectric medium enables the condenser to stand very high voltages, but is open to the objection that after the condenser has been running forany length of time it is apt to become dangerously hot, and in somecases may actually crack open due to the considerable amount of heating which may result.

This may possibly be due to a leakage of current, but whatever the cause may be I have found that the objection spoken of may be remedied by the employmentof the parafiined paper in connection with the varnished paper.

What 1 claim as new and desire to secure by Letters Patent of the United States, is,-

1. An electric condenser built up of sheets of conducting.nraterial separated by juxtaposed sheets of paper, one sheet of paper he mg varnished and the other sheet coated or impregnated with wax.

2. An electric condenser built up of sheets of coinlueting material separated by juxtaposed sheets of paper, one sheet of paper being varnished and the other sheet coated or impregnated with paraffin.

3. An electric condenser built up of sheets I amzvns M mmducting mawgmi'sepgrateai by 11156611 In witpeeg whgroil have hereunto set my sheets 0x paper, 011s sheet, 0f paper be t hand this 28th day of Mxzaran, 1902. (mm-ed with a material having ralatively 4 Q l .J. malstance to puncmm at break down, MATTHEW QROY Witnesses:

V DUGALD M011. MCKILLOP;

Jam; 5. 'WALKEE;

" the other gheet Coated. 0; imgregnated 11 g material havmg z hlghfif msui a'i lon 3+ Jae than the. firstmentione mate-' L 

